Along with the development of LED lighting industry and the technology of LED driver power supply, LED drivers with dimming function play an important role in the LED lighting applications, which also raises higher requirements for their dimming performance gradually. The strobe of an LED driver with high-efficiency, low-ripple and dimming features is studied. The novel driver not only meets the requirements for low-ripple current in LED, but also ensures that the LED lamp generates no flicker and its brightness changes evenly and softly. In addition, it satisfies the requirements of different dimming curves.